(Gd1/7Dy1/7Ho1/7Er1/7Tm1/7Yb1/7Lu1/7)2Si2O7高熵稀土双硅酸盐:一种极具应用潜力的环境障涂层材料
(Gd1/7Dy1/7Ho1/7Er1/7Tm1/7Yb1/7Lu1/7)2Si2O7 high-entropy disilicate:A promising environmental barrier coating material
刘洋 1庄磊 1谢平波 1俞呼雷 1褚衍辉1
作者信息
- 1. School of Materials Science and Engineering,South China University of Technology,Guangzhou 510641,China
- 折叠
摘要
作为一种潜在的环境障涂层材料,高熵稀土双硅酸盐的热物理化学性质至关重要.本文报道了一种新型(Gd1/7Dy1/7Ho1/7Er1/7Tm1/7-Yb1/7Lu1/7)2Si2O7高熵稀土双硅酸盐(7HERED),它兼具与SiCf/SiC复合材料良好的热膨胀系数匹配性、超低的热导率(1 273 K时为1.5 Wm-1 K-1)、高达1973 K的高温稳定性以及在1673 K下优异的耐水氧腐蚀性等优异的综合性能.这种优异的综合性能可归因于7HERED的高熵效应和晶格畸变效应.本文所开发的7HERED有望作为下一代环境障涂层材料.
Abstract
The unique combination of a series of thermal properties and water-oxygen corrosion resistance is crucial for high-entropy disilicates serving as environmental barrier coating materials.Here,we report a novel(Gd1/7Dy1/7Ho1/7-Er1/7Tm1/7Yb1/7Lu1/7)2Si2O7 high-entropy disilicate(7HERED)that simultaneously possesses excellent match of coefficient of thermal expansion with SiCf/SiC composites across 473-1973 K,ultralow thermal conductivity(1.5 Wm-1 K-1 at 1273 K),superior high-temperature stability up to 1973 K,and water-oxygen corrosion resistance at 1673 K.Such su-perior properties are attributed to the high-entropy and lat-tice-distortion effects.Our 7HERED shows great potential as a next-generation environmental barrier coating material.
关键词
high-entropy rare-earth disilicates/thermal physical properties/water-oxygen corrosionKey words
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基金项目
National Key Research and Development Program of China(2022YFB3708600)
National Natural Science Foundation of China(52122204)
出版年
2024
NETL
NSTL
万方数据